When I worked in a manufacturing plant (early 80's) we used Weller soldering stations exclusively and they were quite reliable. Those units had the temperature control knob as we had to solder to Mil-Spec and that required different soldering temperatures.
I have owned a Weller soldering station for the past 25 years. Never had it serviced because it never failed me or had any problems.
I suppose there are good ones and bad ones that come off the assembly line. I must have gotten a good one.